Display screen or portion thereof with a graphical user interface



FIG. 1 depicts a front view of a display screen or portion thereof witha graphical user interface according to a first embodiment.

FIG. 2 depicts a front view of a display screen or portion thereof witha graphical user interface according to a second embodiment.

FIG. 3 depicts a front view of a display screen or portion thereof witha graphical user interface according to a third embodiment.

FIG. 4 depicts a front view of a display screen or portion thereof witha graphical user interface according to a fourth embodiment.

FIG. 5 depicts a front view of a display screen or portion thereof witha graphical user interface according to a fifth embodiment; and,

FIG. 6 depicts a front view of a display screen or portion thereof witha graphical user interface according to a sixth embodiment.

The broken lines illustrate portions of the graphical user interface andform no part of the claimed design.

CLAIM The ornamental design for a display screen or portion thereof witha graphical user interface, as shown and described.